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db.go
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db.go
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package lorm
import (
"github.com/Ai-feier/lorm/internal/errs"
"github.com/Ai-feier/lorm/internal/valuer"
"github.com/Ai-feier/lorm/model"
"context"
"database/sql"
"database/sql/driver"
"errors"
"log"
)
type DBOption func(*DB)
type DB struct {
dialect Dialect
r model.Registry
db *sql.DB
valCreator valuer.Creator
mdls []Middleware
}
// Open 创建一个 DB 实例。
// 默认情况下,该 DB 将使用 MySQL 作为方言
// 如果你使用了其它数据库,可以使用 DBWithDialect 指定
func Open(driver string, dsn string, opts ...DBOption) (*DB, error) {
db, err := sql.Open(driver, dsn)
if err != nil {
return nil, err
}
return OpenDB(db, opts...)
}
func OpenDB(db *sql.DB, opts ...DBOption) (*DB, error) {
res := &DB{
dialect: MySQL,
r: model.NewRegistry(),
db: db,
valCreator: valuer.NewUnsafeValue,
}
for _, opt := range opts {
opt(res)
}
return res, nil
}
func DBWithDialect(dialect Dialect) DBOption {
return func(db *DB) {
db.dialect = dialect
}
}
// DBWithRegistry 更换数据中心实现
func DBWithRegistry(r model.Registry) DBOption {
return func(db *DB) {
db.r = r
}
}
// DBUseReflectValuer 更改数据返回结果实现
func DBUseReflectValuer() DBOption {
return func(db *DB) {
db.valCreator = valuer.NewReflectValue
}
}
// DBUseMiddlewares 注册 Middlewares
func DBUseMiddlewares(mdls ...Middleware) DBOption {
return func(db *DB) {
db.mdls = mdls
}
}
// MustNewDB 创建一个 DB,如果失败则会 panic
func MustNewDB(driver string, dsn string, opts ...DBOption) *DB {
db, err := Open(driver, dsn, opts...)
if err != nil {
panic(err)
}
return db
}
func (db *DB) Close() error {
return db.db.Close()
}
func (db *DB) Wait() error {
err := db.db.Ping()
for errors.Is(err, driver.ErrBadConn) {
log.Println("数据库启动中")
err = db.db.Ping()
}
return nil
}
func (db *DB) queryContext(ctx context.Context, query string, args ...any) (*sql.Rows, error) {
return db.db.QueryContext(ctx, query, args...)
}
func (db *DB) execContext(ctx context.Context, query string, args ...any) (sql.Result, error) {
return db.db.ExecContext(ctx, query, args...)
}
// BeginTx 开启事务
func (db *DB) BeginTx(ctx context.Context, opts *sql.TxOptions) (*Tx, error) {
tx, err := db.db.BeginTx(ctx, opts)
if err != nil {
return nil, err
}
return &Tx{tx: tx, db: db}, nil
}
// DoTx 将会开启事务执行 fn。如果 fn 返回错误或者发生 panic,事务将会回滚,
// 否则提交事务
func (db *DB) DoTx(ctx context.Context,
fn func(ctx context.Context, tx *Tx) error,
opts *sql.TxOptions) (err error) {
var tx *Tx
tx, err = db.BeginTx(ctx, opts)
if err != nil {
return err
}
panicked := true
defer func() {
if panicked || err != nil {
e := tx.Rollback()
if e != nil {
err = errs.NewErrFailToRollbackTx(err, e, panicked)
}
} else {
err = tx.Commit()
}
}()
err = fn(ctx, tx)
panicked = false
return err
}